Telescopic extension-rod.



J. A. LELAND.

TELESCOPIC EXTENSION ROD.

APPLIOATION FILED MAR. e, 1912.

Patented June 25, 1912.

UNITED @AWM OFFICE.

' JON A. LELAND, OF MONTAG-UE, HASSACHUSETH, ASSIGNQBEO'HILLERS FALLSCOMPANY, F MILLEBS FALLS, MASSACHUSETTS, A. COQIOBATION 0I MASSAGHU-renonce.

rnnnscorre nx'rnNsIoNnon.

momwleaommrmen. I PatentedJune25,-191f2. ennemie also loro: e. 191e.smal m. essere.

To all whom t may concern:

Be it known that I, JOHN A. Lamm), a citizen of the United States, and aresident of Montague, in the county of Franklin and 5 State oflllassachusetts, have invented cer.- iain new and useful Improvements inTelescopic Extension-Rods, of which the following is a speciiication.lhis invention relates to telescopic rods 1o or shafts employed forcommunicating rotary motion from a driving part or motor engaged withone end of the rod to a driven part engaged with the opposite end and 1thas for its object to vprovide improved means for adjustably connectingthe members of a telescopic rod o r shaft in such manner ,that thedistance between the driving part .or motor and the driven part may bevaried to a considerable extent an operative connection being maintainedbetween the members so that one is rotated by the other under alladjustments.

The invention as here shown is embodied in a bit extension of telescopicconstruction and having at one end a brace chuck-engaging shank, and atthe other end a bit-engaging chuck, said shank and chuck being carriedby members which are slidable relatively to each other to increase ordiminish the distance-'between `the shank ,and chuck,

automatically engaging devices being provided whereby theextension'members may be locked together Vat any desired adjustment, and`thesaiddevices being manually separable to enable the members to bediscolillnected and adjusted relatively to each ot er.

The invention consists in `the improvements WhichI will now proceedto'describe 40 and claim. v

Of the accompanying A dr .f. twin',g1;s:f-Fig' ure 1. reprsents. a sideelevation of an {extension rod .embodying my invention. Fig. 2represents alongtudinal Section .of the same. Fig, 3 represents anenlargement of a portionof Fig. 1, the tubular member being shown insection. and the movable clutch part engaged therewith in elevation.Fig. 4 repesents a section on line 4 4 of Fig. 3,

showing the rod lmembers. locked together. Fig. 5 represents a viewsimilar to -Figffl showing the rod members unlocked. Fig. 6 representsa. section on line 6-6 of Fig. 3. Fig. 7 represents in diferent referredto.

apart.

erspective 5 views the movable clutch part ereinafterI v an adjustablesleeve 25 which has an inter- The .seme reference characters indicatothe.

same parte in all the gures.

vIn theembcdiment o my invention shown composed of two telescopicmembers, one

carrying the Shank 1 2 and the other the c huck 13, said members beingslidable relat1vely to .each other to increase or decrease the distancevbotvieren the Said shank and chuck; In this embodiment of my inventionthe member 1.4 is an elongated rod pro` vlded with a longitudinal groove15. In the bottom'of sai groove are formed numerous shallow recesses 16drilled in the bottom 0f the rooveand uniformly spaced 80 The ot ermember 17 of the extension rod is tubular and has a sliding it'on themember v14. The tubular member. 17 iS- provided with a movable clutchpart adapted to .engage any of the recesses 16. Said 85 movable clutchpart in this embodiment of my invention inclndes as a whole a lever 18formed -to enter the groove 15 and ovided with a clutch projection 19adapte :to enter any of the recesses 16, and Wtha projection '90 2.0adapted to bear .on the bottom of the groove 15 and constitute a fulclumfor the lever, ,theclntch pro'ection 19 being formed o n the inner sideo one arm of the Ilever, and the outer side of ,said arm being provided.with an inclined face 21. The other arm of the lever yprovided .with apush piece 22 adapted .to be manually operated by pressure against it ofa thumb nail", or xother instrumentality, vto tilt the lever, asindicated by Fig. 5. The lever 18 is inserted in the cove 15 with thefulcrum projec-- tion 20 aring on the bottom of the groove,

A ,spring 23 interposed between the arm of the leve;l which .carries theclutch projection l 19 and a sleeve 24 attached to andforming a part ofthe tubular 17 normally presses the .clutch projection 1.9 into en.gagement with any recess 16 which coin cides therewith,- as shown by Fi.4. The tubular member 17 is provided with e shoulder 27 formed on thetubular member,

it bears on the inclined face 21 and locks the clutch projection19 initsprojectedposition, said projection being engaged wlth one oftheVrecesses 16, as shown by Fig. 4.

l lWhen the-sleeve 25 is adjustedaway from the shoulder 27, as shown byFig. 5, it is suiiientlyl removed `fromthe. highest part of the inclinedface 21-to permit the lever 18 to betilted by pressure of a thumb nailor other instrumentality against the push piece 22, as indicated by Fig.5, the clutch projection 19 being thus withdrawn from locking engagementwith the member 14, so that lelther member may be moved lengthwiserelativel to the other to increase or i .I diminish the ength of theextension rod.

The member 17 is provided with an open- 'ing 28 exposing the pushpiece`22 so that said push piecey may be pressed inwardly in the mannerindicated by Fig. '5. When the pressure on the push piece is removed,the spring 23 presses the clutch projection 19 inwardly and causes it toAinterlock with a recess/16 moved into cincidence' therewith,

the clutch projection being locked in its projected pos1tion byadjusting the sleeve 25 to the position shown by Fig. v.4.

The tubular member 17 is rovided with 1 l 'a longlitudinally groovedmember having a 'ty of recesses at vthe bottom of its a `slot 29, Figs.4 and 6, form to permit the 'l insertion and removalbf the lever 18. Thegreater 4portion of sald slot is coveredby L f one end portion of saidslot is uncoveredV Athe thin sleeve 24 attached to the member 17 by ascrew 31,' said sleeve forming a bearing for the outer end ofthe spring23. v The sleeve 24 is shorter than the slot 29 so that and forms theopening 28 through which'the push piece 22 is exposed.

From the foregoing it will be seen that the members 14 and 17 may besecurely locked together with the shank .121 and chuck 13 at various aart, and that the members may be released m theirlocking'interengagement by first adjusting ythe sleeve 25 to theposition shown by Fig.

- 5 and then prsing the push piece 22 inwardly. When the members havebeenxadjusted to the desired length, the spring 23 projects the clutchprojection 19 into the coinciding fixed recess 16, .the movable i'clutch part bein then locked by returning the sleeve 25 to t e positionshown by Fig. 4.

The sides of the lever 18 abut against the sides of the slot 29 ofthetubular member.

- plura The movable clutch; part which includessaid lever 1s thereforeso engaged with the tubuf lar member that it imparts rotarymotion fromthe grooved member to the tubular member, the edges of the lever 18 'andthe edges of the slot 29 constitutingcomplemental clutch parts for thispurpose.v The movable clutch part'therefore serves to lock the groove, atubular member slidingly engaged with the grooved member, a complementalmovable clutch part movably engaged with the tubular member and composedof a tilting lever ulcrumed in said groove and provided on one arm witha'n inclined face and with a clutch projection which is 'yieldinglyprojected' into locking engagement with a arm of the lever beingprovided with a push piece Vwhereby the clutch projection may bemanually retracted, and a longitudinally adkrecess in the groovedmember, the opposite justable sleeve on the tubular member adapted tocoperate with said inclined face in locking and unlockingthecluthprojection. 2. A telescopic extension rod comprising groove, a`tubular member slidably engaged with the grooved member and havmg alongitudinal slot, a tilting leverfulcrumed in said groove and engagedwith the sides of said slot, said leverbeing provided on one Varm withva clutch projection and with an inclined face, and on the other arm'with a push piece occupying one end Yof said slot, a casing sleevecovering portions of said slot and lever, a spring interposed betweenthe casing sleeve and the lever andadapted to press the clutchprojection into engagement with a recess in the grooved member, and alongitudinally 'f adjustable sleeve 4engaged with the tubular member andadapted to Vcooperate with said inclined face in locking .and unlockingthe clutch projection.

In testimony whereof I have aiiixed my signature, in presence of twowitnesses.

Y JOHN A. LELAND.

Witnesses: i j i KATHERINE E. NICHOLS, Lizzn. B. STRACHAN.

